Rename Project Euler directories and other dependent changes (#3300)

* Rename all Project Euler directories:

Reason:
The change was done to maintain consistency throughout the directory
and to keep all directories in sorted order.

Due to the above change, some config files had to be modified:
'problem_22` -> `problem_022`

* Update scripts to pad zeroes in PE directories

project_euler/problem_048/sol1.py

@@ -0,0 +1,25 @@
+"""
+Self Powers
+Problem 48
+
+The series, 1^1 + 2^2 + 3^3 + ... + 10^10 = 10405071317.
+
+Find the last ten digits of the series, 1^1 + 2^2 + 3^3 + ... + 1000^1000.
+"""
+
+
+def solution():
+    """
+    Returns the last 10 digits of the series, 1^1 + 2^2 + 3^3 + ... + 1000^1000.
+
+    >>> solution()
+    '9110846700'
+    """
+    total = 0
+    for i in range(1, 1001):
+        total += i ** i
+    return str(total)[-10:]
+
+
+if __name__ == "__main__":
+    print(solution())